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arXiv · 1810.04874

Stability of Standing Waves for a Nonlinear Klein-Gordon Equation with Delta Potentials

Elek Csobo·François Genoud·Masahito Ohta·Julien Royer
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Abstract

In this paper, we study local well-posedness and orbital stability of standing waves for a singularly perturbed one-dimensional nonlinear Klein-Gordon equation. We first establish local well-posedness of the Cauchy problem by a fixed point argument. Unlike the unperturbed case, a noteworthy difficulty here arises from the possible non-unitarity of the semigroup generating the corresponding linear evolution. We then show that the equation is Hamiltonian and we establish several stability/instability results for its standing waves. Our analysis relies on a detailed study of the spectral properties of the linearization of the equation, and on the well-known 'slope condition' for orbital stability.

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Elek Csobo, François Genoud, Masahito Ohta, Julien Royer. 2019-11-08. Stability of Standing Waves for a Nonlinear Klein-Gordon Equation with Delta Potentials. https://doi.org/10.1016/j.jde.2019.08.015

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